Beneficiaries Equity of the Parent Company - Number of Shares and Net Income Used to Calculate Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Income (loss) from continuing operations	$ (1,323)	$ 3,058	$ 44,987	$ 11,652
Net (income) loss from continuing operations attributable to non-controlling interests	22	(2)	(367)	(60)
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(184)	(177)
Distribution to preferred shareholders	(1,725)	(1,725)	(3,450)	(3,450)
Net income (loss) attributable to Common Share/Unit holders of entity	(3,105)	1,255	40,986	7,965
Net income (loss) attributable to common share/unit holders, Diluted	$ (3,105)	$ 1,255	$ 40,986	$ 7,965
Denominator
Basic weighted average shares outstanding (in shares)	175,013,291	179,860,284	174,901,118	179,712,428
Contingent securities/Share based compensation (in shares)	0	678,603	922,852	886,837
Diluted weighted average shares outstanding (in shares)	175,013,291	180,538,887	175,823,970	180,599,265
Earnings per Common Share:
Net income (loss) attributable to common shareholders, Basic (USD per share)	$ (0.02)	$ 0.01	$ 0.23	$ 0.04
Net income (loss) attributable to common shareholders, Diluted (USD per share)	$ (0.02)	$ 0.01	$ 0.23	$ 0.04